题目内容

_________ caused the accident is still a mystery.
A．HowB．WhatC．ThatD．Where
B

试题分析：句意：什么事情引起的这个事故仍然是一个谜。这里是what引起的主语从句，what在从句中作主语，从句作主语时，谓语动词一般情况下应该单数；that在主语从句中，不作成分；how与where不能在从句中做主语，因为这里缺少的是主语从句的连词，并且连词在从句中作主语，故选B。
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